Blindstitch sewing machine



W. ARBETTER BLIND STITCH SEWING MACHINE Ja'n. 25, 1927.

Filed Feb. 24. 1921 Patented 25, 1927. I

UNITED STATES PATENT OFFICE.

WOLF ARBETTER, DECEASED, LATE OF BOSTON, MASSACHUSETTS; BY ESTHER H. .AB/BETTER, ADMINISTRATRX, F NEW YORK, N. Y.

IBLINDSTITCH SEWING MACHINE.

Application led February 24, 1921. Serial No. 447,536.

This invention relates to a sewing ma- In the accompanying drawings I have 50 chine vof the type well-known to the trade illustrated a simple construction and aras felling or blind stitching machines which rangement embodying the principles of this are used to stitch together two layers of invention in which:

cloth and which are characterized by making Figure l is a front elevation showing the stitches passing entirely lthrough the upper supporting mechanism for the underneath 55 layer but only part way through the lower presser foot in operative relation to the layer of cloth as in the case of sewing linbender and its actuating mechanism. ings into sleeves or sewing down the in- Figure 2 is a side elevation partly in folded fabric of Va trousers leg or sleeve so central section of the vertically sliding caras to avoid leaving a raw or unnished edge riage and the associated bender. 69 on the garment.. Figure 3 is a plan view of the carriage In this class of machines as heretofore conmember. structed it hasbeen necessary to make ma- Figure 4 is a plan view showing the upper chines as right and left machines since the end of the vertical guide-post.

work could only be presented from one side of Figure 5 is a plan view showing the re- 55 the work table, and in cases where it is neceslation of the underneath presser, the bender sary to present the work from the other and the guide-post. side of the machine must be built with the In the accompanying drawings I have stitching and feeding'l mechanism reversed. illustrated only such parts of a blind stitch- It is the object of the present invention to ing machine of well-known construction 70 provide a machine of this kind with such such as that shown in the patent to Bailey construction and arrangement that either 1,091,619 as may be necessary to understand righthand or left-hand stitching may be the construction and use of my improved performed on the machine, 'and even specialmechanism. Since this invention relates ly difficult work suchas the stitching in of lonly to the underneath work supporting YI linings or reenforcing patches to the seat and parts and the associated bender, I have at crotch of trousers may be satisfactorily pertempted to indicate in the drawings only formed on the same machine, thus adding the position of the stitching needle and the so greatly to the range ofV work possible on feeding and cooperating upper presser foot a single machine and thereby lessening the Vwith which the parts concerned in my in- 8o number of machines required for the work vention have cooperative relation. in a garment factory. In practice of the invention according to To this end the invention consists, genthe illustrative form shown in the drawerally speaking, in the combination with a ings, I mount the usual vertically yielding vertically' slidable carriage, of an upwardly slidable carriage 4 in guideways formed in 85 extending post of relatively narrow cross the vertical frame l of the machine which section in whichis Vmounted a downwardly is surmounted by the usual table 2. The l yielding presser element. acting to normally vertically yielding slidable carriage 4 is held 40 press the work vup against the overhead in its slideway by the usual removable front presser foot, combined with a vertically plate 3, and is supported on a helical spring 90 movable bender arranged to pass up through 7 whose tension is made adjustable by means an opening in the yielding presser in order of the hollow supporting nut 8 carried in a to intermittently raise and crease or fold part of the frame work. At its rear the in the fabric to properly present. the fabric carriage is provided with a projecting boss to the stitching needle. `This and other 4 adapted to be engaged by a lever a by 95 4 features of the invention will be particularly means of which the carriage is depressed explained in the following specification and or lowered from operative position. will be defined in the claims hereto annexed. The upward movement of the carriage 4,

the Vfixed stop 9. Q

The carriage is provided at its upper end with a lateral offset portion or head 5 and projecting above this upper end of the carriage in a vertical hollow or tubular guide-*post 10 which, in this case, is united lirmly to the carriage by means of an end stud 10d which passes through a receiving aperture in the carriage and is held in place by a clamping nut on its lower end. llhis construction is preferred in order to make the guide-post readily removable-for substitutions or repairs, but the feature of removability is not essential to the proper operation of the de vice.

Inside the guide-post is mounted a plunger 11, whose upper end is provided with an enlarged head 12 adapted to form a downwardly yielding presser to press upward that portion of the cloth that is being stitched by the needle 50 in cooperation with the overhead presser foot and the feed dog 51. ln the form shown, the presser foot plunger 11 rests upon helical spring 18 carried by the guide-post 10 so that the underneath worlesupporting presser 12 is pressed up against the overhead presser foot and feed dog by a yielding pressure, said upward movement being limited by a ixed stop member which in this case is shown as a setl screw 13 tapped into the guide-post and projecting into a slot 11'nl in the side of the plunger 11. At its upper end the tubular guide-post is provided with upwardly extending lugs or projections 10a on either side of the plunger board 10b, arranged so as to closely engage the vertical sides of the presser 12 to firmly support and guide it in its operative position and to prevent any rotative or torsional movement of the presser. In this form one side face of the guide-post is left dat as shown at 10 to form a flat vertical guide surface for the bender arm lil, whose reduced end 15 projects through a small aperture in that portion of the presser that overhangs or projects beyond the guide-post. For properly positioning` the work the opposite ends of the presser are bevelled as shown at 12a, 12".

The bender in this case comprises an angularly formed arm 1a having a straight middle portion adapted to slide vertically in a guide groove 6 formed in the horizontal head 5 of the main carriage a. Adjacent to this slot 6, there is attached to the top of the head 5, by screws or otherwise, a slotted guide plate 16 whose slot extends te the forward et ge of the plate and is closed by a front plate or part 15 detachably secured to the plate 16 so as to permit the ready removal of one bender and the substitution of another.

The bender is actuated by the usual mechanism comprisinea spring-pressed plunger 20, mounted in bearings 30, formed on the front plate and yieldingly supported by an upwardly thrusting spring 25 whose upper end engages one of the collars 21, adjustably secured to the plunger. Between these collars project-s actuating stud Ll0 carried on the end of a cam-actuated rock-arm 11, by which the plunger il) is depressed at the desired intervals in the operation of the machine. rlhe bender arm 14 is pulled downwardly into operative engagement with the upper end of the plunger 2() by means of the contractile spring 19 whose other end may be fastened to any suitable part such as the upper collar 21. This causes the bender to follow the downward movement of the plunger induced by the cam lever l1, while the abutting of the ends of the two members acts to force the bender upward into action against the cloth when the position of the cam permits. The position of the cani is indicated in dotted lines on Figure 1.

By the above construction and arrangement the usual work-support having an opening or recess in its top for receiving the presser is entirely dispensed with, and a presser of narrow dimensions is projected so far above the machine table that it permits the presentation of the work from either the front or the rear side 0r in an angular position so that it is entirely practicable to blind stitch either right-hand or left-hand work or to perform special lining work such as the seat lining of trousers loo without diHiculty. While the bender arm is shown as of angular construction it will be understood that this is not essential to the proper operation of the device, the bender being made in this form to facilitate quick 105 removal and replacement, and in that connection also to prevent any torsional or twisting movement of the bender.

lVhat I claim is:

1. A work-supporting carriage, a rela- 110 tively narrow vertically bored guide-post projecting upward therefrom, a springpressed plunger having sliding engagement with said bore, said plunger having a rela tively long and narrow head forming a work-supporting presser whose ends overhang the outer wall of the-guide-post and whose sides are engaged with opposed upwardly projecting guide lugs formed on the guide-post, and a cooperating bender 130 arranged to be movable through the presser into operative engagement with the work, substantially as described.

2. In a blind stitch sewing machine, the combination of a yieldingly supported carriage, a tubular guidewpost of relatively small cross section detachably secured to said carriage., and projecting upwardly therefrom, a slidable plunger fitted into the bore of said tubular .guide-post and yieldingly pressed upward therein, said plunger being provided at its upper end with a presser head that is narrower than the width of the guide-posi; so as to be guided between opposite upward extensions of the guide-post, means for limiting the upward spring-induced movement of the plunger, and a bender arranged t0 be moved through an opening in the presser head to act on the Work, substantially as described. 10 In Witness whereof, I have subscribed the above specification.

ESTHER H. ARBETTER, Admz'mstmtid of Wolf Arbetzer, deceased. 

